<footer>
    <div>
        <h2>版权所有 &copy 大大怪 .LIT</h2>
    </div>
</footer>
<style>
    footer div h2{
        width: 100%;
        text-align: center;
        height: 50px;
        background: #333;
        color: #fff;
        position: fixed;
        bottom: 0;
        left: 0;
        line-height: 50px;
        font-size: 16px;
    }
</style>